MHK ISDB/Tests/Power Performance/Wave Energy Converter
Power Performance: Wave Energy Converter
To measure the WEC's power performance (measure of the capability of a WEC to produce electric power) for specific wave characteristics, populate the power matrix, and estimate annual energy production.
Overview for Open Ocean Testing
The power matrix should be determined by simultaneous measurements of the wave climate, the power output from the WEC at the test site and external factors such as wind, current, water depth and mooring line tensions (if applicable). Based on IEC 62600-100 TS Ed 1, WEC power should be reported via a normalized power matrix that is constructed using the "method of bins". The specifications are:
- significant wave height with a maximum bind width of 0.5 meters
- energy period with a maximum width of 1.0 seconds
With power measurements being divided into a 2 dimensional array of bins, the measurement period for each combination of bins must be sufficiently long to establish a statistically significant database over the desired ranges of significant wave height and energy period. For wind, IEC 61400-12-1 recommends that at least 30 min of data be collected for each bin which should include at least three independent and valid data sets to allow a basic level of statistical analysis. According to IEC 62600-100 TS Ed 1, if the WEC is connected to the grid, the grid needs to be monitored for export capacity that might constrain the WEC output capacity.
Net electric power should be based on measurements of current and voltage on each phase. Sample rates should be at least 2 Hz and full-scale range of the power measurement device should be set to -50 % to +200 % of WEC rated power. For certification purposes, transducers must meet the requirements of the following standards and should be class 0.5 or better – specific details are given in 62600-100 TS Ed 1 and IEC 61400-12-1. Ideally, the power transducers need to be places as close to the generator as possible to limit line loss. If measurements are made some distance away, the line loss must be accounted for.
Directional Spectra (Wave) search
AC Power (Power) search
DC Power (Power) search
AC Power Factor (Power) search
AC Voltage (Voltage) search
DC Voltage (Voltage) search
AC Current (Electric Current) search
DC Current (Electric Current) search
Heading (Orientation) search
Roll and Pitch (Orientation) search
Altitude (Position) search
Bathymetry (Position) search
Depth (Position) search
- IEC 62600-100 TS Ed 1